Cancellation of subscription which is still ongoing after 2 months of cancellation request

I requested cancellation of the alarm system and response on 27/01/2023. I even called in to get it cancelled and spoke to a consultant who confirmed cancellation in February. My account was debited month ending February and now in March. I'm very disappointed and ran out of ideas on how to get my subscription cancelled. Worse part is that the subscription is part of my credit record.